Light and scanning electron microscopic study of the tongue in the Bali myna (Leucopsar rothschildi)

Document Type : (original research)

Authors

Department of Basic Sciences, Faculty of Veterinary Medicine, Shahrekord University, Shahrekord, Iran

10.22034/aej.2023.365520.2897

Abstract

The aim of the present study was to investigate the light and electron microscopic structure of the tongue in the Bali myna (Leucopsar rothschildi). 6 adult Bali myna (3 males and 3 females) were used in the present study. For light microscopic study. Tissue samples from the apex, body and root of the tongue were stained with hematoxylin and eosin (H&E) and periodic acid Schiff (PAS) and studied using light microscopy. For scanning electron microscopical studies of the lingual surface, the fixed samples were prepared and observed using a scanning electron microscope. The tongue in Bali myna has an elongated structure and is wide and triangular in the posterior part. Three parts are distinguished in the dorsal surface of the tongue: the apex, the body and the root. The surface of the organ does not have a median groove. A large number of needle-shaped processes with equal size and high density are located on both sides of the apex and anterior part of the body of the tongue. Large caudally directed conical papillae with a V-shaped arrangement are found between the body and the root of the organ. The surface of the tongue has no gustatory and lingual papillae. At electron microscopic level, fine micro-grooves can be seen on the surface of the root of the organ. Salivary gland pores are clearly found on the dorsal surface of the lingual root. The surface of the tongue is lined with keratinized stratified squamous epithelium in the apex and body of the organ, and with non-keratinized stratified squamous epithelium in the root region. A unique feature of the lingual structure in the Bali myna is that the tubuloalveolar PAS-positive salivary glands are found only in the root of the organ, and lingual salivary glands are not present in the apex and body of the organ. Morphological and morphometric features of the tongue do not show any sexual dimorphism. Overall, the results showed that the tissue structure of the tongue in Bali myna is similar to other birds and has specific characteristics in the region of the apex and the distribution of salivary glands.

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Main Subjects

References

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Journal of Animal Environment
Volume 15, Issue 4
February 2024
Pages 145-152

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